From 956d2afcb2da7cb7f2de0bdc9d341f14edf95e63 Mon Sep 17 00:00:00 2001
From: whitequark <whitequark@whitequark.org>
Date: Tue, 17 Nov 2015 03:06:07 +0300
Subject: [PATCH] compiler.iodelay: fold Max further.

---
 artiq/compiler/iodelay.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/artiq/compiler/iodelay.py b/artiq/compiler/iodelay.py
index 3941ea22e..ec9a73729 100644
--- a/artiq/compiler/iodelay.py
+++ b/artiq/compiler/iodelay.py
@@ -213,7 +213,7 @@ class Max(Expr):
             operand = operand.fold(vars)
             if isinstance(operand, Const):
                 consts.append(operand.value)
-            else:
+            elif operand not in exprs:
                 exprs.append(operand)
         if any(consts):
             exprs.append(Const(max(consts)))